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CHAMPIONSHIP ENGINE COMPONENTS<br />

MADE IN THE USA<br />

SHORT BLOCKS TOP KITS BLOCKS HEADS MANIFOLDS CRANKSHAFT ACCESS SBC LS BBC SBF HON COATINGS BILLET<br />

QUICK INFO >>><br />

Serious street performance, mild bracket racing and<br />

oval track. Maximum torque and throttle response from<br />

3,500 to 7,800 RPM. Best for 363-427 cubic inch engines.<br />

Works with most standard components.<br />

Every intake port, exhaust runner, valve bowl,<br />

and every combustion chamber is 100% CNC<br />

machined on special dedicated PRO1 castings.<br />

These heads are ideal for high compression,<br />

big cubic inch small blocks and are great for<br />

supercharged applications.<br />

Exhaust runners are raised .135” for improved<br />

flow. Manganese Bronze valve guides are used<br />

for long life, and hardened valve seats provide<br />

durability with unleaded fuels. Features 3.000"<br />

exhaust bolt pattern.<br />

Assemblies include Stainless Steel valves,<br />

premium springs, locks, retainers, studs, guide<br />

plates and seals.<br />

Heads are sold individually.<br />

20°<br />

225cc<br />

CNC<br />

PRO1 20° 225cc CNC - ALUMINUM<br />

62cc COMBUSTION CHAMBERS<br />

PART NO. CONFIGURATION FOR USE MAX. LIFT<br />

13072040 Bare Head<br />

13072142 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”<br />

13072143 1.550” Dual Springs for Solid Roller Cam .700”<br />

SMALL BLOCK FORD<br />

CAST ALUMINUM CYLINDER HEADS<br />

Head parts kit - see page 118.<br />

Uses 7/16” screw-in rocker studs.<br />

Assemblies with 1.550” valve spring<br />

use +.100” long valves.<br />

PRO1 20° 225cc CNC SPECS<br />

Material:<br />

RMR Cast<br />

Aluminum Alloy<br />

Valve Angle:<br />

20° (stock)<br />

Intake Port Volume: 225cc CNC<br />

Intake Valve: 2.080”<br />

Exhaust Valve: 1.600”<br />

Chamber Volume: 62cc<br />

FLOW DATA @ 28” WATER<br />

LIFT INTAKE EXHAUST<br />

.200” 136 115<br />

.300” 201 164<br />

.400” 259 205<br />

.500” 300 225<br />

.600” 323 231<br />

.700” 325 238<br />

Not intended for sale or use with pollution controlled vehicles.<br />

110<br />

248.362.1188 / DARTHEADS.COM Connect with us socially, search: DART MACHINERY

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